Missing Helper

I have seen this issue discussed and resolved in other posts but I have tried everything that I have read and I am still getting the error Error occured - Error during rendering report: Missing helper: "isnt"
I have a global_helpers.js asset created with the shared helpers attached to each template checked.
The content of my global_helpers.js is as follows:

Actually, I think I may have figured this one out but not sure. If I remove the first line var handlebars = require('handlebars'); in the global_helpers.js it appears to work again. I think this is because there is a handlebars var already exposed globally and the code I have above is overwriting it and attaching the helpers to the new instance.

That does appear to fix the issue. Not sure why this just started happening.
If this in fact the solution, I think the tip/howto on at the bottom of https://jsreport.net/learn/handlebars might need to be updated.